No, its 24815- screw,lensboard slide lock, size not listed for the top lensboard sliding retainer.._________________The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

Anniversary Speeds, 4x5 format, use T nut inserts and it is assumed the 3x4 does also. The 4x5 appears to have the threaded inserts pressed in and the front standard is plastic (Bakelite?)

So these T nut's are steel, inserted into the Bakelite.

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The lensboard slide lock screw on the 4x5 is a #1-64, .25 inch total length, .045 head thickness (fillister head closest style I can find), .08 shoulder.

Knew it had to be longer.. Where to purchase?
Doubt Ace would have it, but I'll check in the morning.
Pin vise, ha a tool I never knew existed.. but how else with such a small screw, to clamp it...will get one...

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Tap drill for a #1-64 is a #53 drill bit.

If I drill the screw out with the #53, being the same size, I'll have to awful careful, or I'll get the threads to. So how to center.. give me a clue.
Looking at pictures of a Pin vise, it doesn't look like it will automatically center into the hole.

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Using a 1.4 or smaller slot type jewelers screwdriver keep the tip 90° (right angle) to the thread and push to the left (counterclockwise), the screw may unscrew if it is not seized or bottomed.

Both screws are broken within the threaded hole, not at the surface.
But if I could wedge a smaller tip inside the drilled void, it could come out.

Looking at pictures of a Pin vise, it doesn't look like it will automatically center into the hole.

A pin vise is a clamp that will go down to zero clearance in the jaws where most drills will not go tighter than 1/16.

Talk to a good machinist. Larger stuff use a center punch to make a start indention._________________The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

Get the old out first then find some new ones. You might be able to tap the inserts to 2-56 and modify the slots in the slide lock to fit the larger screw. Graflex might have used a different screw size in the 3x4 also.

I would go with Brass or Stainless Steel for the metal type as zinc plated steel will eventually rust._________________The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

Well Ace had a #53 bit, but not a Pin Vise
Came home and dug around and found old grandpa's hand drill, with wood vertical handle with bits inside. Tall guy with hand crank, and gears.
Lovely!
Had to lube it up with 3 in One oil, but was perfect for the job, as all the weight is centered on the bit. Bet the drill is older than the camera by a bit.
Gave it a try, out in the sun's light, and it self centered, and the darn screws turned out to be brass. That was a surprise, as looking under the magnifying glass, of the broken end of the screw, it looked like metal.
Drilled out with the magnifying glass, can see the threads in there, but I don't believe there is a metal insert, just backelite.
Found some brass 1-64's, just had to buy 50, so were in duck soup and see how they fit when they arrive.

Got the 1-64's, small brass screws with a Phillips head, shortest I could get them was 1/4", which was a little long. No problem, went to ace and a nut for a 1-72 will tread on, easily, and act as a spacer and also makes a little wider head to hold the metal plate on.

Were back in business.

Got 48 of these little darlings left.. if anybody has a need, e-mail me with your address, and I'll mail ya a couple.

Tip: screw 2 nuts onto the screw you need shorter. Position the nut closest to the end of the screw at the length from the head that you need and tighten the second nut against the first. Cut the screw next to the front nut with a fine blade hacksaw or cutoff wheel in a rotary tool. Unscrewing the nuts will remove any burs. If the screw did not cut smoothly dress it with a file before removing the nuts._________________The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

Tip #2: more difficult than tip 1. Use a Taper file and follow the thread of the screw from 1 to 2 turns above the cut to the cut keeping a V of the file centered in the thread._________________The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.